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I believe that Chris (The Topher) told me it was something like 400 degrees Fahrenheit before the temper was affected ? That would feel a lot hotter then the bare hand could tolerate. Still any heat...

I was at forum member The Topher's house some time ago and he was restoring some old blades. A bit of grinding here and there and polishing with the Dremel. He had a glass of water on the workbench...